Ernest w



(No Model.)

' E. W. NAYLOR. HYDRAULIC PRESS.

No. 437,933. I Patented Oct. 7, 1890. i

11719 HUN.

SC/7L 34 [0 gwmowtoz UNITED STATES PATENT OFFICE.

nnnnsrw. NAYLOR, or New YORK, N. Y.

HYDRAULIC PRESS.

SPECIFICATION forming part of Letters Patent No. 437,933, dated October7, 1890.

Application filed .Tune 11, 1889. Serial No. 313,949. (No model.)

To all whom it may concern.-

Be it known that I, ERNEST WV. NAYLOR, a citizen of the United States,and a resident of the city, county, and State of New York, have inventedcertain new and useful Improvements in Hydraulic Presses, of which thefollowing is a full, clear, and exact description, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to presses which are adapted to be operated byfluid or other pressure, and its object is to provide means forintensifying or multiplying the pressure on the main ram after theinitial pressure thereon has expended its power. To this end myinvention consists of an auxiliary cylinder secured to the main cylinderof an ordinary hydraulic press, said auxiliary cylinder having two ramsworking therein of unequal diameters, the smaller of the two passingthrough the head of the main cylinder into the fluid-space therein.

In order that my invention may be more clearly understood, I haveillustrated it in the accompanying drawings, and will proceed todescribe the same.

Figure 1 represents a vertical central section of my improved press.Fig. 2 is a plan View of the same.

The same letters and numerals of reference indicateidentical parts inboth the figures.

In the drawings, 1 1 represent the supporting-frame of the press, whichmay be of the ordinary construction, to which is secured the maincylinder E, open at one end and provided in its side near the top with aport 0. In the cylinder E is a ram E, closely fitting the bore of thecylinder and having in its inner end a cavity E Secured to the closedend or head of the cylinder E is an auxiliary cylinder H, having ports Aand B near its ends. In the auxiliary cylinder His the usual piston orram D, of a diameter equal to the bore of the cylinder, to which issocured a ram F of smaller diameter, which passes through the head ofthe cylinder, as shown, in line with the cavity E of the ram E.

The operation is as follows: The fluid or other pressure being admittedinto the cylinder or rain E from any suitable valve through port 0,forces down the ram E upon the work until the pressure of the fluid inthe cyllinder of ram E is overcome and the ram will move no farther. Thepressure is then admitted to the ram D through port A, which forces downthe ram D, and with it the small rain F, which, acting upon the fluid inthe ram E, compacts or intensifies the same, and thereby causes it toexert an increased pressure on the main ram E. \Vhen it is desired tohave the full stroke of the rain E at the intensified pressure after thefirst stroke of the ram D has been made, the pressure is admitted atport 13, thereby lifting the ram D, pressure at the same time beingadmitted at port O to fill the space caused by the withdrawal of the ramF, when pressure is again admitted at A, and so on through the entirestroke of ram E.

While I have shown and described my improved press as provided with butone auxiliary or intensified ram, I do not wish to be confined thereto,as it is obvious that the main ram may be provided with two or moreintensifier rams, as desired, without depart ing from the principle ofmy invention, in which case a press of great and varied power wouldresult.

Having described my invention, what I claim, and desire to secure byLetters Patent, is

1. As a means for increasing the power of hydraulic presses, theintensifier herein described, consisting of a suitable cylinder securedto the main cylinder of the press and provided with a ram or plungerwhich is forced through the head of the main cylinder into the liquidalready therein, and thereby intensifying the pressure, substantially asdescribed.

2. As an improvementin hydraulic presses, the combination, with the maincylinder or ram, the plunger of which is provided with a central cavityin its inner face, of an auxiliarycylinder secured to the head of themain cylinder and having two plungers of unequal diameters workingtherein, the smaller of scribed, I have hereunto set my hand this said.plungers adapted to enterthe fluid-space 7th day of June, 1889.

of the main cylinder in line with the cavity 1 in the main plunger,substantially as and for ERNESI NAYLOR' 5 the purposes described.Witnesses:

In testimony that I claim the foregoing im- ADOLPH HESS,

provement in hydraulic presses, as above de- WHEATON S. LOWRY.

